package com.fivestar.pmanager.core.util;

import java.io.UnsupportedEncodingException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

public class MD5Util
{

    private static final String SALF_FINAL = "MD5PWD";

    private static final int MD5_PASSWORD_TIME = 3;

    private static final int MD5_EXPRESS_PASSWORD_TIME = 1;

    /*
     * 下面这些S11-S44实际上是一个4*4的矩阵，在原始的C实现中是用#define 实现的， 这里把它们实现成为static
     * final是表示了只读，切能在同一个进程空间内的多个 Instance间共享
     */
    /** The Constant S11. */
    static final int S11 = 7;

    /** The Constant S12. */
    static final int S12 = 12;

    /** The Constant S13. */
    static final int S13 = 17;

    /** The Constant S14. */
    static final int S14 = 22;

    /** The Constant S21. */
    static final int S21 = 5;

    /** The Constant S22. */
    static final int S22 = 9;

    /** The Constant S23. */
    static final int S23 = 14;

    /** The Constant S24. */
    static final int S24 = 20;

    /** The Constant S31. */
    static final int S31 = 4;

    /** The Constant S32. */
    static final int S32 = 11;

    /** The Constant S33. */
    static final int S33 = 16;

    /** The Constant S34. */
    static final int S34 = 23;

    /** The Constant S41. */
    static final int S41 = 6;

    /** The Constant S42. */
    static final int S42 = 10;

    /** The Constant S43. */
    static final int S43 = 15;

    /** The Constant S44. */
    static final int S44 = 21;

    /** The Constant PADDING. */
    static final byte[] PADDING = { -128, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
            0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
            0 };
    /*
     * 下面的三个成员是MD5计算过程中用到的3个核心数据，在原始的C实现中 被定义到MD5_CTX结构中
     */
    /** The state. */
    private long[] state = new long[4]; // state (ABCD)

    /** The count. */
    private long[] count = new long[2]; // number of bits, modulo 2^64 (lsb
                                        // first)

    /** The buffer. */
    private byte[] buffer = new byte[64]; // input buffer

    /*
     * digestHexStr是MD5的唯一一个公共成员，是最新一次计算结果的 　 16进制ASCII表示.
     */
    /** The digest hex str. */
    public String digestHexStr;

    /*
     * digest,是最新一次计算结果的2进制内部表示，表示128bit的MD5值.
     */
    /** The digest. */
    private byte[] digest = new byte[16];

    /*
     * getMD5ofStr是类MD5最主要的公共方法，入口参数是你想要进行MD5变换的字符串
     * 返回的是变换完的结果，这个结果是从公共成员digestHexStr取得的．
     */
    /**
     * Gets the m d5of str.
     * 
     * @param inbuf the inbuf
     * @return the m d5of str
     */
    public String getMD5ofStr(String inbuf)
    {
        md5Init();
        md5Update(inbuf.getBytes(), inbuf.length());
        md5Final();
        digestHexStr = "";
        for (int i = 0; i < 16; i++)
        {
            digestHexStr += byteHEX(digest[i]);
        }
        return digestHexStr;
    }

    // 这是MD5这个类的标准构造函数，JavaBean要求有一个public的并且没有参数的构造函数
    /**
     * Instantiates a new m d5 util.
     */
    public MD5Util()
    {
        md5Init();
        return;
    }

    /* md5Init是一个初始化函数，初始化核心变量，装入标准的幻数 */
    /**
     * Md5 init.
     */
    private void md5Init()
    {
        count[0] = 0L;
        count[1] = 0L;
        // /* Load magic initialization constants.

        state[0] = 0x67452301L;
        state[1] = 0xefcdab89L;
        state[2] = 0x98badcfeL;
        state[3] = 0x10325476L;

        return;
    }

    /*
     * F, G, H ,I 是4个基本的MD5函数，在原始的MD5的C实现中，由于它们是
     * 简单的位运算，可能出于效率的考虑把它们实现成了宏，在java中，我们把它们 　　实现成了private方法，名字保持了原来C中的。
     */

    /**
     * F.
     * 
     * @param x the x
     * @param y the y
     * @param z the z
     * @return the long
     */
    private long F(long x, long y, long z)
    {
        return (x & y) | ((~x) & z);

    }

    /**
     * G.
     * 
     * @param x the x
     * @param y the y
     * @param z the z
     * @return the long
     */
    private long G(long x, long y, long z)
    {
        return (x & z) | (y & (~z));

    }

    /**
     * H.
     * 
     * @param x the x
     * @param y the y
     * @param z the z
     * @return the long
     */
    private long H(long x, long y, long z)
    {
        return x ^ y ^ z;
    }

    /**
     * I.
     * 
     * @param x the x
     * @param y the y
     * @param z the z
     * @return the long
     */
    private long I(long x, long y, long z)
    {
        return y ^ (x | (~z));
    }

    /*
     * FF,GG,HH和II将调用F,G,H,I进行近一步变换 FF, GG, HH, and II transformations for
     * rounds 1, 2, 3, and 4. Rotation is separate from addition to prevent
     * recomputation.
     */

    /**
     * FF.
     * 
     * @param a the a
     * @param b the b
     * @param c the c
     * @param d the d
     * @param x the x
     * @param s the s
     * @param ac the ac
     * @return the long
     */
    private long FF(long a, long b, long c, long d, long x, long s, long ac)
    {
        a += F(b, c, d) + x + ac;
        a = ((int) a << s) | ((int) a >>> (32 - s));
        a += b;
        return a;
    }

    /**
     * GG.
     * 
     * @param a the a
     * @param b the b
     * @param c the c
     * @param d the d
     * @param x the x
     * @param s the s
     * @param ac the ac
     * @return the long
     */
    private long GG(long a, long b, long c, long d, long x, long s, long ac)
    {
        a += G(b, c, d) + x + ac;
        a = ((int) a << s) | ((int) a >>> (32 - s));
        a += b;
        return a;
    }

    /**
     * HH.
     * 
     * @param a the a
     * @param b the b
     * @param c the c
     * @param d the d
     * @param x the x
     * @param s the s
     * @param ac the ac
     * @return the long
     */
    private long HH(long a, long b, long c, long d, long x, long s, long ac)
    {
        a += H(b, c, d) + x + ac;
        a = ((int) a << s) | ((int) a >>> (32 - s));
        a += b;
        return a;
    }

    /**
     * II.
     * 
     * @param a the a
     * @param b the b
     * @param c the c
     * @param d the d
     * @param x the x
     * @param s the s
     * @param ac the ac
     * @return the long
     */
    private long II(long a, long b, long c, long d, long x, long s, long ac)
    {
        a += I(b, c, d) + x + ac;
        a = ((int) a << s) | ((int) a >>> (32 - s));
        a += b;
        return a;
    }

    /*
     * md5Update是MD5的主计算过程，inbuf是要变换的字节串，inputlen是长度，这个
     * 函数由getMD5ofStr调用，调用之前需要调用md5init，因此把它设计成private的
     */
    /**
     * Md5 update.
     * 
     * @param inbuf the inbuf
     * @param inputLen the input len
     */
    private void md5Update(byte[] inbuf, int inputLen)
    {

        int i, index, partLen;
        byte[] block = new byte[64];
        index = (int) (count[0] >>> 3) & 0x3F;
        // /* Update number of bits */
        if ((count[0] += (inputLen << 3)) < (inputLen << 3)) count[1]++;
        count[1] += (inputLen >>> 29);

        partLen = 64 - index;

        // Transform as many times as possible.
        if (inputLen >= partLen)
        {
            md5Memcpy(buffer, inbuf, index, 0, partLen);
            md5Transform(buffer);

            for (i = partLen; i + 63 < inputLen; i += 64)
            {

                md5Memcpy(block, inbuf, 0, i, 64);
                md5Transform(block);
            }
            index = 0;

        }
        else

            i = 0;

        // /* Buffer remaining input */
        md5Memcpy(buffer, inbuf, index, i, inputLen - i);

    }

    /*
     * md5Final整理和填写输出结果
     */
    /**
     * Md5 final.
     */
    private void md5Final()
    {
        byte[] bits = new byte[8];
        int index, padLen;

        // /* Save number of bits */
        Encode(bits, count, 8);

        // /* Pad out to 56 mod 64.
        index = (int) (count[0] >>> 3) & 0x3f;
        padLen = (index < 56) ? (56 - index) : (120 - index);
        md5Update(PADDING, padLen);

        // /* Append length (before padding) */
        md5Update(bits, 8);

        // /* Store state in digest */
        Encode(digest, state, 16);

    }

    /*
     * md5Memcpy是一个内部使用的byte数组的块拷贝函数，从input的inpos开始把len长度的 　　　　　
     * 字节拷贝到output的outpos位置开始
     */

    /**
     * Md5 memcpy.
     * 
     * @param output the output
     * @param input the input
     * @param outpos the outpos
     * @param inpos the inpos
     * @param len the len
     */
    private void md5Memcpy(byte[] output, byte[] input, int outpos, int inpos, int len)
    {
        int i;

        for (i = 0; i < len; i++)
            output[outpos + i] = input[inpos + i];
    }

    /*
     * md5Transform是MD5核心变换程序，有md5Update调用，block是分块的原始字节
     */
    /**
     * Md5 transform.
     * 
     * @param block the block
     */
    private void md5Transform(byte block[])
    {
        long a = state[0], b = state[1], c = state[2], d = state[3];
        long[] x = new long[16];

        Decode(x, block, 64);

        /* Round 1 */
        a = FF(a, b, c, d, x[0], S11, 0xd76aa478L); /* 1 */
        d = FF(d, a, b, c, x[1], S12, 0xe8c7b756L); /* 2 */
        c = FF(c, d, a, b, x[2], S13, 0x242070dbL); /* 3 */
        b = FF(b, c, d, a, x[3], S14, 0xc1bdceeeL); /* 4 */
        a = FF(a, b, c, d, x[4], S11, 0xf57c0fafL); /* 5 */
        d = FF(d, a, b, c, x[5], S12, 0x4787c62aL); /* 6 */
        c = FF(c, d, a, b, x[6], S13, 0xa8304613L); /* 7 */
        b = FF(b, c, d, a, x[7], S14, 0xfd469501L); /* 8 */
        a = FF(a, b, c, d, x[8], S11, 0x698098d8L); /* 9 */
        d = FF(d, a, b, c, x[9], S12, 0x8b44f7afL); /* 10 */
        c = FF(c, d, a, b, x[10], S13, 0xffff5bb1L); /* 11 */
        b = FF(b, c, d, a, x[11], S14, 0x895cd7beL); /* 12 */
        a = FF(a, b, c, d, x[12], S11, 0x6b901122L); /* 13 */
        d = FF(d, a, b, c, x[13], S12, 0xfd987193L); /* 14 */
        c = FF(c, d, a, b, x[14], S13, 0xa679438eL); /* 15 */
        b = FF(b, c, d, a, x[15], S14, 0x49b40821L); /* 16 */

        /* Round 2 */
        a = GG(a, b, c, d, x[1], S21, 0xf61e2562L); /* 17 */
        d = GG(d, a, b, c, x[6], S22, 0xc040b340L); /* 18 */
        c = GG(c, d, a, b, x[11], S23, 0x265e5a51L); /* 19 */
        b = GG(b, c, d, a, x[0], S24, 0xe9b6c7aaL); /* 20 */
        a = GG(a, b, c, d, x[5], S21, 0xd62f105dL); /* 21 */
        d = GG(d, a, b, c, x[10], S22, 0x2441453L); /* 22 */
        c = GG(c, d, a, b, x[15], S23, 0xd8a1e681L); /* 23 */
        b = GG(b, c, d, a, x[4], S24, 0xe7d3fbc8L); /* 24 */
        a = GG(a, b, c, d, x[9], S21, 0x21e1cde6L); /* 25 */
        d = GG(d, a, b, c, x[14], S22, 0xc33707d6L); /* 26 */
        c = GG(c, d, a, b, x[3], S23, 0xf4d50d87L); /* 27 */
        b = GG(b, c, d, a, x[8], S24, 0x455a14edL); /* 28 */
        a = GG(a, b, c, d, x[13], S21, 0xa9e3e905L); /* 29 */
        d = GG(d, a, b, c, x[2], S22, 0xfcefa3f8L); /* 30 */
        c = GG(c, d, a, b, x[7], S23, 0x676f02d9L); /* 31 */
        b = GG(b, c, d, a, x[12], S24, 0x8d2a4c8aL); /* 32 */

        /* Round 3 */
        a = HH(a, b, c, d, x[5], S31, 0xfffa3942L); /* 33 */
        d = HH(d, a, b, c, x[8], S32, 0x8771f681L); /* 34 */
        c = HH(c, d, a, b, x[11], S33, 0x6d9d6122L); /* 35 */
        b = HH(b, c, d, a, x[14], S34, 0xfde5380cL); /* 36 */
        a = HH(a, b, c, d, x[1], S31, 0xa4beea44L); /* 37 */
        d = HH(d, a, b, c, x[4], S32, 0x4bdecfa9L); /* 38 */
        c = HH(c, d, a, b, x[7], S33, 0xf6bb4b60L); /* 39 */
        b = HH(b, c, d, a, x[10], S34, 0xbebfbc70L); /* 40 */
        a = HH(a, b, c, d, x[13], S31, 0x289b7ec6L); /* 41 */
        d = HH(d, a, b, c, x[0], S32, 0xeaa127faL); /* 42 */
        c = HH(c, d, a, b, x[3], S33, 0xd4ef3085L); /* 43 */
        b = HH(b, c, d, a, x[6], S34, 0x4881d05L); /* 44 */
        a = HH(a, b, c, d, x[9], S31, 0xd9d4d039L); /* 45 */
        d = HH(d, a, b, c, x[12], S32, 0xe6db99e5L); /* 46 */
        c = HH(c, d, a, b, x[15], S33, 0x1fa27cf8L); /* 47 */
        b = HH(b, c, d, a, x[2], S34, 0xc4ac5665L); /* 48 */

        /* Round 4 */
        a = II(a, b, c, d, x[0], S41, 0xf4292244L); /* 49 */
        d = II(d, a, b, c, x[7], S42, 0x432aff97L); /* 50 */
        c = II(c, d, a, b, x[14], S43, 0xab9423a7L); /* 51 */
        b = II(b, c, d, a, x[5], S44, 0xfc93a039L); /* 52 */
        a = II(a, b, c, d, x[12], S41, 0x655b59c3L); /* 53 */
        d = II(d, a, b, c, x[3], S42, 0x8f0ccc92L); /* 54 */
        c = II(c, d, a, b, x[10], S43, 0xffeff47dL); /* 55 */
        b = II(b, c, d, a, x[1], S44, 0x85845dd1L); /* 56 */
        a = II(a, b, c, d, x[8], S41, 0x6fa87e4fL); /* 57 */
        d = II(d, a, b, c, x[15], S42, 0xfe2ce6e0L); /* 58 */
        c = II(c, d, a, b, x[6], S43, 0xa3014314L); /* 59 */
        b = II(b, c, d, a, x[13], S44, 0x4e0811a1L); /* 60 */
        a = II(a, b, c, d, x[4], S41, 0xf7537e82L); /* 61 */
        d = II(d, a, b, c, x[11], S42, 0xbd3af235L); /* 62 */
        c = II(c, d, a, b, x[2], S43, 0x2ad7d2bbL); /* 63 */
        b = II(b, c, d, a, x[9], S44, 0xeb86d391L); /* 64 */

        state[0] += a;
        state[1] += b;
        state[2] += c;
        state[3] += d;

    }

    /*
     * Encode把long数组按顺序拆成byte数组，因为java的long类型是64bit的， 只拆低32bit，以适应原始C实现的用途
     */
    /**
     * Encode.
     * 
     * @param output the output
     * @param input the input
     * @param len the len
     */
    private void Encode(byte[] output, long[] input, int len)
    {
        int i, j;

        for (i = 0, j = 0; j < len; i++, j += 4)
        {
            output[j] = (byte) (input[i] & 0xffL);
            output[j + 1] = (byte) ((input[i] >>> 8) & 0xffL);
            output[j + 2] = (byte) ((input[i] >>> 16) & 0xffL);
            output[j + 3] = (byte) ((input[i] >>> 24) & 0xffL);
        }
    }

    /*
     * Decode把byte数组按顺序合成成long数组，因为java的long类型是64bit的，
     * 只合成低32bit，高32bit清零，以适应原始C实现的用途
     */
    /**
     * Decode.
     * 
     * @param output the output
     * @param input the input
     * @param len the len
     */
    private void Decode(long[] output, byte[] input, int len)
    {
        int i, j;

        for (i = 0, j = 0; j < len; i++, j += 4)
            output[i] = b2iu(input[j]) | (b2iu(input[j + 1]) << 8) | (b2iu(input[j + 2]) << 16)
                    | (b2iu(input[j + 3]) << 24);

        return;
    }

    /*
     * b2iu是我写的一个把byte按照不考虑正负号的原则的＂升位＂程序，因为java没有unsigned运算
     */
    /**
     * B2iu.
     * 
     * @param b the b
     * @return the long
     */
    public static long b2iu(byte b)
    {
        return b < 0 ? b & 0x7F + 128 : b;
    }

    /*
     * byteHEX()，用来把一个byte类型的数转换成十六进制的ASCII表示，
     * 　因为java中的byte的toString无法实现这一点，我们又没有C语言中的 sprintf(outbuf,"%02X",ib)
     */
    /**
     * Byte hex.
     * 
     * @param ib the ib
     * @return the string
     */
    public static String byteHEX(byte ib)
    {
        char[] Digit = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F' };
        char[] ob = new char[2];
        ob[0] = Digit[(ib >>> 4) & 0X0F];
        ob[1] = Digit[ib & 0X0F];
        String s = new String(ob);
        return s;
    }

    /**
     * To m d5.
     * 
     * @param source the source
     * @return the string
     */
    public static String toMD5(String source)
    {
        MD5Util md5 = new MD5Util();
        return md5.getMD5ofStr(source);
    }

    /**
     * 多次加密
     * 
     * @param source
     * @param n 次数
     * @return （大写）
     */
    public static String MD5Times(String source, int n)
    {
        for (int i = 0; i < n; i++)
        {
            source = toMD5(source);
        }
        return source.toUpperCase();
    }

    /**
     * MD5.
     * 
     * @param name the name
     * @param password the password
     * @return the string
     */
    private static String Md5Password(String phone, String value, String password, int times)
    {
        StringBuffer sbuffer = new StringBuffer();
        sbuffer.append(phone);
        sbuffer.append(value);
        sbuffer.append(password);
        return MD5Times(sbuffer.toString(), times);
    }

    /**
     * md5加密
     * 
     * @param phone
     * @param password
     * @return
     */
    public static String Md5Password(String phone, String password)
    {
        return Md5Password(phone, SALF_FINAL, password, MD5_PASSWORD_TIME);
    }

    /**
     * 验证输入的手机号码和密码 是否和数据库保存的匹配
     * 
     * @param phone
     * @param inputpassword
     * @param password
     * @return true:正确
     */
    public static boolean checkPassword(String phone, String inputpassword, String password)
    {
        return password.equals(Md5Password(phone, inputpassword));
    }
    
    /*** 
     * MD5加码 生成32位md5码 
     */  
    public static String string2MD5(String inStr){  
        MessageDigest md5 = null;  
        try{  
            md5 = MessageDigest.getInstance("MD5");  
        }catch (Exception e){  
            System.out.println(e.toString());  
            e.printStackTrace();  
            return "";  
        }  
        char[] charArray = inStr.toCharArray();  
        byte[] byteArray = new byte[charArray.length];  
  
        for (int i = 0; i < charArray.length; i++)  
            byteArray[i] = (byte) charArray[i];  
        byte[] md5Bytes = md5.digest(byteArray);  
        StringBuffer hexValue = new StringBuffer();  
        for (int i = 0; i < md5Bytes.length; i++){  
            int val = ((int) md5Bytes[i]) & 0xff;  
            if (val < 16)  
                hexValue.append("0");  
            hexValue.append(Integer.toHexString(val));  
        }  
        return hexValue.toString();  
  
    }  
  
    /** 
     * 加密解密算法 执行一次加密，两次解密 
     */   
    public static String convertMD5(String inStr){  
  
        char[] a = inStr.toCharArray();  
        for (int i = 0; i < a.length; i++){  
            a[i] = (char) (a[i] ^ 't');  
        }  
        String s = new String(a);  
        return s;  
  
    } 
    
    /**
     * MD5加密字符串
     * @param val
     * @return
     * @throws java.security.NoSuchAlgorithmException
     */
    public static String MD5(String val)  {
        byte[] hash;
        
        try {
            hash = MessageDigest.getInstance("MD5").digest(val.getBytes("UTF-8"));
            
        } catch (NoSuchAlgorithmException e) {
            throw new RuntimeException("MD5 should not be supported!", e);
        }catch (UnsupportedEncodingException e) {
            throw new RuntimeException("UTF-8 should not be supported!", e);
        }
        
        StringBuilder hex = new StringBuilder(hash.length * 2);
        for (byte b : hash) {
            if((b & 0xFF) < 0x10) hex.append("0");
            hex.append(Integer.toHexString(b & 0xFF));
        }

        return hex.toString();
    }

    // public static void main(String[] args) {
    // String method = "takeoutoverdue";
    // System.out.println("method="+method);
    // SimpleDateFormat sdf = new SimpleDateFormat("yyMMddHHmmssSSS");
    // Date date = new Date();
    // String ds = sdf.format(date);
    // System.out.println("REQTIME="+ds);
    // String sdeviceid = "dcdz1001";
    // System.out.println("sdeviceid="+sdeviceid);
    // String sign = toMD5(sdeviceid+method+ds);
    // System.out.println(sign);

    // System.out.println(Md5Password("18551672622","qwe123"));

    // System.out.println(Md5ExpressPassword("935101"));
    // System.out.println("A0317402FE1CA416DFF84F7B40B37D0A");
    // System.out.println(Md5Password("10000000000","dd123456"));

    // System.out.println(Md5Password("12312345625","123456"));
    // }

    public static void main(String[] args)
    {
        System.out.println(MD5Util.string2MD5("qqqqqq"));
    }
}
